Typewriting machine



Aug. l1, 1925.

C. B. CORCORAN TYPEWRITING MACHINE Filed June 24, 1924 /nvenort rta-misa ag. miens.

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To all whom t may concern.'

" Be it lmown4 that CORNELIUS B ConoonAN,

deceased, late a citizen of the United States,

and late residing in the borough of Bronx,

t county of Bronx, city and State of New York, invented certain new and useful Improvements in Typewriting Machines, of

which the following is a specification.

This invention relates to typewriting mawhiclthet per-bars are hung on a curved wire, carrie by aradally slotted segment, and are operated from the keyboard 4to delivera whiplilre stroke against the platen. l5

` arrested, just prior to contact o the types against the platen, b a rigid stop or anvil' portion of the typear segment acting as an interponent, to avoid the tendenc ont the type-bars to chatter or rebound ma ing reated impressions on a work-sheet; but ue to the acquired momentum of the typeheadsjand the resiliency of the type-bars, the heads spring forward suiciently to deso liver an eli'ective blow of thetypes upon a ribbon overlying the work-sheet.

" Such impact between the metallic surfaces of the type-bars and inte ral or anvil surface oi the ent pro uces a clattering noise of Isuch intensity as to constitute an annoyance, and it is, therefore, one of the f features of thepresent invention toyprovide improved means for minimizing such metalvsecuring a segmental stop upon-the level,

upright face of the'segment in which the type-bars are pivoted, ordinarily utilizing openings which exist therein for 'attaching purposesythell stop having one 4or more rows of raised surfaces -for typefbar contact and being provided .with sound-reducing ele- Ordinarily theblows o the ty e-barsarelic sounds andl still maintain the, advantages ments proven by use to be eiective. More than one embodiment is shown as illustrative of the general spirit of the invention, which is not limited, however, by the exact constructions indicated.

'Other features and advantages will hereinaiter appear. l

In the accompanying drawings, Y.

Fi ure 1 is a front elevational view'of a typear scent, as applied to a machine of the Underwood type, showing the application of an embodiment of the invention, the platen appearing in dot-anddash lines.

F1gure 2 is a transverse sectional view of the same,y the section being taken on line 2-"2 of Figure 1, and the tye-bar shown in full lines, as connected to t e segment in a l rest position, the bar bein also shown in a raisedposition in dot-an -dash lines.

Fi re 3 isa view similar to F1 re 1,

but rawn to a smaller scale, and s owing a modified form of stop.

Figure 4 is a transverse sectional view taken on line 4-4 of Figure 3 and drawn to an increased scalea Figure 5 is a view like Figure 3, showing a further modification in the stop construc' tion.

In the drawings only such parts of a typewriting machine are shown as relate directly to the invention Athe other parts being of ordinary well-lm closure. The platen, designated by numeral 10, is of the revoluble cylindrical type mounted to shift into upper and lower.. u

case positions to receive an impact from either of the type-characters carried on the.v

t pe-heads 11, the same being ixedon the ree ends of type-bars 12, ivoted on an arcuate rod 13, and actuated y links 14 engag'itllxg the bars near their pivoted ends.

e type-bars shown are of the Under wood pattern, and the links 14, as will be readily understood, are moved by their connection with 4key-:trimmed levers 'on the keyboard (not shown) in the ordinary manner.

The pivot-rod 13 is housed in the lower part of a-type-bar segment 15 having slots. 16 to guide the ty -bars, and an extending integral rib 17 c caring the type-bars at the own construction, unaifected by and unrelated to this dend of their operative stroke. The segment l w is fixed by screws 18 to the front part ofthe typewriting machine frame, indicated at 19, the construction being weil known.

As shown in Figures 1 and 2, there is secured to the flat level upright face 2O oi. the segment 15 an arcuate stop 21 formed from astrip of spring-tempered, hard metal having rounded ends and being provided with radially-extending lugs 22 near its ends, at its convex lower edge, through which pass headed binding screws 23 holding the segmental stop 21 firmly upon the face of the segment 15.

Formed in the stop or anvil, is a groove or recess 24 extending from end to end therei'.oi" and presenting a moderately yieldable convex upper surface for arresting the typebars just prior to the impact of the types against the platen, as Vcan be seen in Figure 2. It is to be understood, however, that the type-heads will continue in their movement until an impression has been made on the work-sheet through a ribbon (not shown), the stop 21 acting to prevent chattering of the type-head, and to reduce the noise oc- '.-zcasioned by the impact of the type-bar against a positively rigid, unyielding surface, lsuch as the segment face direct.

In the modification illustrated in Figures 3 and 4, a plate of flexible metal is used ter the stop 25, the same being formed to present two outstanding hollow ribs 26 and 27 raised from the face 20 of the segment, to which the plate is` attached by screws 28 passing through plate-extensions 29, equivalent f to themlugs 22, as previously described.

The ribs are spaced concentrically with the contour of the plate and segment, and their concave under surfaces have secured to them a filler 3() of relatively soft yielding material, as Jfelt, a layer 31 of which is interposed between the entire under surface of the plate and the face 20 of the se ment, as can be seen in Figure 4. The fet lining acts as an effective sound-absorbent, eliminating the emission of sound caused by impact of the type-bar against the ribs, and materially softens the blow of the type-bar without affecting the desired result obtained by the` anvil-ribs.

As a further means for preventing sound I from issuing, the plate 25 may have in its lower convex portion a plurality of slits or incisions 32 (Figure 5),' arranged radially.

in spaced relation, and extending inwardly ."from the edge nearly to the lower rib 27,

this comb-like structure eiectually breaking the sound-waves and rendering the machine substantially noiseless so far as the type impact is concerned.

The recesses 33 1n the devices shown in Figures 3 and 5 are merely to clear certain tric raised hollow ribs extending throughout its length, noise-absorbent material carried in the rib cavities and disposed over the under surface ot the plate, and means for securing the stop on the segment.

2. In a typewriting machine, the combination with type-bars and a support to which the type-bars are pivoted, of a` stop to arrest the type-bars at their impression strokes, said stop being comprised of spring material shaped to conform with the support and having one or more raised longitudinal ribs, a felt filler fixed in the rib cavities, a felt sheet interjacent the stop and support, and means for fastening the stop upon the face of' theV sp'port. 5"' 'Ww 3. In a typewrit-ing machine, the combination with type-bars and a support to which the type-bars are pivoted, of a stop to arrest the type-bars at their impression strokes, said stop being comprised of spring material shaped to conform with the support and havlng one or more raised longitudinal ribs, a felt filler fixed in the rib cavities, a felt sheet interjacent the stop and support, said stop having a plurality of slits in its lower edge, and means for fastening the stop to the face of the support.

4. In a typewriting machine, the co1nbination with type-bars and a support to which -the type-bars are pivoted, of a stop to arrest the type-bars at their impression strokes, said stop consisting of a plate, raised hollow ribs formed integrally on the plate and extending substantially its full length, a plurality of radial incisions extending in from the lower edge of the plate, means to secure the 'stopnpon the level central surface of 

